OpenCL option not available in Blender 2.78c running on Ubuntu 17.04
As of march 2017 GCN 1.0 is no longer supported for gpu rendering.
Because the R5 M330 is using that architecture you won't be able to use it anymore in blender.



Sources:


https://wiki.blender.org/index.php/Dev:Source/Render/Cycles/OpenCL#Current_issues_and_limitations
https://en.wikipedia.org/wiki/AMD_Radeon_RX_300_series#Mobile_products